Suspension insulator



Dec. 20, 1927. 1,653,117

J. M. PECK SUSPENSION INSULATOR Filed June 26. 1925 gwumvfofq (fa/UL .M 1156/6 Patented Dec. 20, 1927.

UlTED STATES JOE-IN IE. BECK, OF HONEOYE FALLS, NEW YORK, ASSIGNOR TO THEPORCELAIN IN- SULATOR CORPORATION, OF LIMA, NEW YORK, A CORPORATION OF NEVJ' YORK.

SUSPENSION INSULATOR.

Application filed ,Tune 26, 1925.

My invention relates to a suspension in sulator and has for its object to afford an eflicient and practical construction for attaching an eyebolt within the hollow por tion of an insulating unit.

More particularly, the purpose of the improvement is to permanently secure an eyebolt in place in such a way as to permit a slight relative movement between the insulating unit-and eyebolt under abnormal conditions in order to prevent fracture of the insulating material, while not substantially affecting the desirable rigid connection between the eyebolt and insulating unit under normal operating conditions.

To these ends, the invention comprises the structure which will appear clearly from the following description when read in conjunction with the accompanying drawing, the novel features being pointed out in the claim at the end of the description.

In the drawing:

Figure 1 is a vertical. sectional view of a conventional type of suspension insulator showing the application of my invention, the thimble appearing in elevation, and

Figure 2 is an enlarged view with parts broken away, showing the thimble in sec tion.

The invention may be carried out in a variety of ways, and in its preferred embodi ment includes the conventional unit 1 of insulating material with a hollow interior and skirt portion 2. Arranged within the hollow portion of the insulating unit 1, is a retaining device consisting of' a t-himble, preferably coextensive with said hollow portion, and corrugated or threaded at its lower portion 3 to hold the cement i that is filled between the thimble and insulating unit 1 to hold the thimble in place. 5 designates an elastic or resilient cement, such as sarco, that is interposed between the end of the thimble and the adjacent surface of the insulating material.

6 designates a bolt member or eyebolt having an enlarged end 7 which affords on its underside an inclined shoulder disposed at approximately 45 to the longitudinal axis of the bolt member. The bolt member is permanently held within the thimble, which is preferably spun upon the end of the bolt member, and the thimble has a shoulder 8 corresponding to the shoulder on the bolt member and arranged at a similar angle Serial No. 39,835.

with reference to the longitudinal axis of the bolt member so as to support the latter when it is in normal position, as shown in Figure 2.

There is a slight clearance between the enlarged end 7 and the surrounding portion of the thimble, the normal distance between said parts being approximately 1/6-Ct of an inch, and when the end of the bolt member is resting upon the shoulder 8, as in Figure 2, this results in an approximate clearance of about 1/32 of an inch, as indicated at 9, between the end of the thimble and the adjacent surface of the bolt member. When the bolt member is carrying a load and the parts are arranged in normal relationship as in Figure 2, there is a firm and substan tially rigid connection between the bolt member and thimble, but the space between said parts permits a slight rocking of the bolt member and slight endwise movement of the latter which is suflicient to permit the necessary yielding and prevent fracture of the cement or insulating material upon expansion or contraction of the parts due to temperature changes.

The parts referred to are manufactured by first spinning the thimble on the bolt memher, after which the thimble with the bolt member attached thereto is cemented within the insulating unit. If desired, or found expedient, the interior of the sleeve, between the inner surface thereof and the bolt member, indicated at 10, may be filled with a resilient or elastic insulating material.

The invention may be modified in other respects than as indicated above, and this application is intended to cover any modified arrangement or departure coming within the intent of my improvement or the scope of the following claim.

I claim:

A suspension insulator comprising a hollow unit of insulating material, a bolt member having a cylindrical body and an enlarged end portion, said end portion having a flat base and a shoulder on its underside at approximately 45 to the longitudinal axis of the bolt member, and a one-piece integral thimble surrounding the body and enlarged end portion of said bolt member, said thimble having a flat end parallel. to and slightly spaced from the base of the bolt member, said flat end being spaced from the lUll insulator body and said space being filled with a layer of resilient cement, said thimble having a constricted portion surrounding the body of said bolt member, the shoulder on the bolt member being in contact with and supported by said constricted portion, said thimble further having a flared portion diverging from the body of said bolt member in a direction away from said enlarged end, said flared portion terminating in a corrugated portion spaced a substantial distance from and entirely free from the body of said bolt member, said thimble being positioned within a cavity in the insulator body, and cement filling the space between the side Walls of said cavity and the sides of said thimble, the thimble having a seamless and unbroken periphery to prevent seepage of cement to the interior of the thimble.

In Witness whereof, I have hereunto signed my name.

JOHN M. PECK. 

